Prerequisites Do you know the C language? No -> Maybe it's too early to read this article :man-shrugging: Do you know what is the difference betweek stack and heap? No -> go here! Do you know what is a buffer overflow? No -> go here! Do you have a basic knowledge of malloc internals? No -> go here and then here! Do you know the tcache poisoning technique? No -> go here! What is House of Einherjar? House of Einherjar is an heap exploitation technique that exploits a single null byte overflow (or "off-by-one overflow") to force a malloc call into returning an arbitrary pointer.